package com.example.demo.common;

import com.example.demo.constant.Constants;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@Component
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session =request.getSession();
        if(session != null && session.getAttribute(Constants.SESSION_USER_INFO)!=null){
            return true;
        }
        response.setStatus(401);//401 是http的状态码
        //返回false,拦截成功
        return false;
    }
}
